Bose 4400 8.2.3 Amplifier fault

53 of 66

8.0 FreeSpace® 4400 System Troubleshooting

8.2.3 Amplifier fault

The AMP OUTPUT LEDs work in pairs (1 and 2, 3 and 4) and indi-

cate the operating status of the four amplifier output channels.

When an amplifier fault occurs, the amplifier mutes its outputs

and indicates an error. After a short period of time the amplifier

will try to operate again. If the fault condition persists, the ampli -

fier will attempt to restart six times, after which it will remain

muted.

Amplifier faults are typically caused by a shorted loudspeaker

line, an overdriven amplifier, or a saturated output transformer.

• To check for a shorted loudspeaker line, remove the loud-

speaker connection from the amplifier channel. If this resolves

the problem, locate and correct the shorted loudspeaker line.

• To make sure that you are not overdriving the FreeSpace 4400

output, change to a different source. If the problem no longer

exists, use the FreeSpace 4400 Installer™ software to reduce

the input level of the original source that was overdriving the

output.

• To make sure an output transformer is not being saturated,

check to see if the correct loudspeaker EQ setting is selected.

If none of these actions solve the problem, read the instructions

in the following flow chart or check the error log using the

FreeSpace 4400 Installer™ software .

Check for

• Shorted wiring

• Overdriven amplifier

(reduce output gain)

• Transformer saturation

• Entry in FreeSpace

4400 Installer™ soft-

ware error log

OUTPUTS

1234SYSTEM

STATUS

1234

INPUTS

DIRECT

INPUT

STANDBY

AMP OUTPUT

indicators are red

Has the FreeSpace

4400 system shut

down during

operation?

• Check the number of loudspeak-

ers connected to the FreeSpace

4400 system. Verify that the total

sum of loudspeaker taps con-

nected to the FreeSpace 4400

system does not exceed 400W.

• Verify that there are no shorts on

the loudspeaker output lines.

No

Yes

• Switch POWER to OFF.

• Disconnect the load and switch

POWER to ON.

• Verify that there are no shorts on

the loudspeaker output lines.

See amplifier fault troubleshooting

section for course of action.

Is SYSTEM

STATUS indicator

green?

Does the

FreeSpace 4400

Installer™ software

Error Log list

any amplifier

faults?

Yes

No

No

Yes

Contact your local

Bose representative or

visit pro.Bose.com

Contents

Main Safety Information Please read this owners guide Important Safety Information Caution marks on the product Important safety instructions Information about products that generate electrical noise Contents 1.0 FreeSpace 4400 Introduction 1.1 The Bose FreeSpace 4400 Business Music System 1.2 FreeSpace 4400 system accessories 1.0 FreeSpace 4400 Introduction 1.3 FreeSpace 4400 Installer software 2.1 Introduction 2.2 Basic design steps 2.2.1 Step 1 Determine source routing 2.2.2 Step 2 Determine Auto Volume requirements Guidelines for establishing Auto Volume zones Page Mic 6' 6' 6' 6' 2.2.3 Step 3 Determine volume control requirements 2.2.4 Step 4 Determine the loud- speaker requirements 2.2.5 Step 5 Determine the FreeSpace 4400 requirements 2.3 Auto Volume layout examples Page Hotel lobby 3.0 FreeSpace 4400 Hardware Description 3.1 Front panel 3.1.1 Controls 3.1.2 Indicators 3.0 Freespace 4400 Hardware Description 3.2 Rear panel 3.2.1 System controls 3.2.2 Audio source inputs 3.2.3 Amplifier outputs 4.1 Introduction 4.2 Included accessories 4.3 Placement guidelines 4.4 Shelf mounting the FreeSpace 4400 system 4.5 Rack mounting the FreeSpace 4400 system 4.6 Installing accessories 4.6.1 Sensing microphones Required accessory: Microphone installation: Recommended wire length: Assembly: 1300 ft (396 m) max. 4400 ABD User interface schematic - AVM (Auto Volume/Mute)user interface*: 4.6.4 User interface connections 4.7 System wiring 4.7.1 Serial data communications 4.7.2 Remote standby switch 20 of 66 4.7.3 LINE 1/LINE 2 source input XLR 4.7.4 AUX MIC/LINE 3 source input XLR Phone Plug (Balanced) 4.7.5 PAGE/MIC/LINE 4 source input 4.7.6 DIRECT IN/CONTROL source input Source Connector 4400 PAGE/MIC/LINE 4 Source Connector 4400 DIRECT IN/CONTROL 4.7.7 Amplifier ZONE OUTPUT outputs + 4.7.9 ZONE 4 LINE OUT output 4.8 AC power connections 4.8.1 Fuse type 4.8.2 AC POWER connection Source Connector 4400 ZONE 4 LINE OUT 5.1 Installing the software 5.2 Connecting to the FreeSpace 4400 system Page 5.2.1 No hardware detected 5.2.2 Incompatible microcontroller code 5.2.3 Sample design files Page Tool box Mode buttons Window sizing tools 5.4 Set Up Hardware mode 5.5 Set Up Schedule mode 5.5.1 Setting the clock 5.5.2 Adding events 5.5.3 Viewing and changing event settings 5.5.4 Removing events from the list 5.6 Service Hardware mode 6.1 Introduction 6.2 Connecting your PC to a FreeSpace 4400 system 6.3 System setup procedure 6.3.1 Output gain Output gain circuit block diagram Output gain setup sequence Page Gain Setup 6.3.2 Zone setup 6.0 FreeSpace 4400 System Setup To add a subzone Input gain circuit block diagram To delete a subzone 6.3.3 Input gain Input gain setup sequence Input gain controls 6.3.4 Source assign To assign a source to a zone To unassign a source To route a source to a zone To set up paging in a zone 6.3.5 Source EQ Source EQ operation 6.3.6 Page setup Fixed-zone pag i ng default settings Page setup with Opti-voice system on (default) 6.0 FreeSpace 4400 System Setup Page setup with Opti-voice control off Page setup controls Setting up Multi-zone paging Paging operation 6.3.7 Zone EQ ZONE EQ operation 6.3.8 Dynamic EQ 6.3.9 Auto Volume IMPORTANT: Before you calibrate Auto Volume Auto Volume setup procedure Page Page Resetting a calibrated Auto Volume zone When to repeat the Auto Volume calibration Auto Volume controls Auto Volume operation Changing Auto Volume Tracking after calibrating a zone 7.1 Enabling keypad operation 7.2 Turning the system on 7.3 AVM user interface operation 50 of 66 AVM 1-Zone User Interface Example AVM 2-Zone User Interface Example 7.4 Page user interface operation 52 of 66 8.1 Introduction 8.2 FreeSpace 4400 hardware indicators 8.2.1 Normal operation These ar e the indication s of normal operation. 8.2.2 System fault 8.2.3 Amplifier fault 54 of 66 8.2.4 Input clipping If clipping is occurring at the input of an amplifier channel, the source LED will blink red. 8.2.5 Direct input is active 8.2.6 No STANDBY and SYSTEM indicators 8.3 FreeSpace 4400 system Error Log 8.3.1 Contents of the Error Log 8.3.2 Hardware configuration 8.3.3 Power-on self-test results Bose FreeSpace 4400 Er ro r Lo g 8.3.4 Amplifier alarms Amplifier alarms using output voltage and current Amplifier alarms using rail voltage Amplifier alarms input and output status Input and output alarm history 8.3.5 Solving faults reported in the Error Log 8.4 Common problems 8.4.1 Communications port error 8.4.2 No audio in zone 59 of 66 8.4.3 User interface keypads do not operate correctly 8.4.4 Bad sound in a zone 8.4.5 Auto Volume does not calibrate 8.5 Customer support 8.5.1 Technical assistance 8.5.2 Reporting software bugs and issues To find the temporary file directory For Windows 2000, or Windows XP: For Windows NT: For Windows 98 9.0 Restoring FreeSpace 4400 Microcontroller Code IMPORTANT! Page 10.0 Technical Specifications 10.1 Power amplifier 10.2 Digital signal processing 10.3 Front panel indicators and control connections 10.4 Rear panel inputs, outputs, and controls 10.0 Technical Specifications Serial command table Bose Product Sales Conditions For how long: What we will do: How you can obtain Limited Warranty service: Remedies: